.tsx File — TypeScript JSX Source

TSX files combine TypeScript's static type system with JSX markup syntax, providing type-safe React (or compatible framework) component development. TSX is essentially TypeScript that includes JSX expressions — HTML-like markup interspersed with type-annotated JavaScript logic. This combination enables compile-time detection of errors in both the component logic and the JSX markup, including prop type validation, event handler type checking, and component composition type safety. TSX has become the standard file format for modern React development with TypeScript, used by the majority of professional React projects. The TypeScript compiler handles both the type checking and JSX transformation, converting TSX into standard JavaScript. TSX files benefit from excellent IDE support including autocomplete for HTML attributes, CSS class names, component props, and inline type error highlighting. Major frameworks and meta-frameworks including Next.js, Remix, and Astro use TSX as their primary component format. TSX represents the intersection of type safety and declarative UI development that has become the industry standard for building complex web applications.